BIO152H5 Chapter Notes - Chapter 7: Microfilament, Nuclear Membrane, Pinocytosis
Document Summary
The structure of cell components is closely related to their function. Inside cells, materials are transported to their destinations with the help of molecular zip codes or postal codes. Thousands of chemical reactions occur each second within cells; molecules constantly enter and exit across the plasma membrane; cell products are shipped along protein fibres; and elements of the cell"s internal skeleton grow and shrink. Looking at cell structure, there are two broad groupings of life: Looking into groupings by evolutionary history, there are two types of prokaryotic cells, called bacteria and archaea, in addition to the eukarya. The prokaryotic plasma membrane surrounds the cytoplasm, a term that includes all the contents of the cell. Most prokaryotic species have one supercoiled circular chromosome containing dna that is found in the nucleoid region of the cell. All prokaryotic cells contain ribosomes for protein synthesis. Ribosomes have a large and a small subunit and contain both rna and protein molecules.
